Mechanical quality factor of a sapphire fiber at cryogenic temperatures
Abstract
A mechanical quality factor of 1.1 × 107 was obtained for the 199 Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K. Consequently, we confirm that pendulum thermal noise of cryogenic mirrors used for gravitational wave detectors can be reduced by the sapphire fiber suspension.
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